4. 去掉第二个not。

3. 去掉a。fun为不可数名词，意为“有趣的人或事”。

2. walk→walking。look forward to doing sth为固定用法，其中to介词。

1. 去掉it。learn与English存在逻辑上的动宾关系，所以应去掉it。

8. This story reminded me what happened ten years ago.

Keys：

7. You like sports, when I like reading.

6. There are a plenty of eggs in the basket.

5. He always keeps his words; he is a man of his word.

4. He dare not speak English before such a crowd, dare not he?

3. Peter is a good fun and we all enjoy being with him.